<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../vue.js"></script>
</head>

<body>
    <div id="app">
        <input type="text" v-model = "str"><br/>

        <button @click = "sort(0)">正常排序</button>
        <button @click = "sort(1)">升序</button>
        <button @click = "sort(2)">降序</button><br/>

        <ul>
            <li v-for = "item in person2" :key = "item.id">
                姓名:{{item.name}}--年龄:{{item.age}}--性别:{{item.gender}}
            </li>
        </ul>


    </div>
    <script>
        Vue.config.productionTip = false;

        const vm = new Vue({
            el: "#app",
            data() {
                return {
                    str: "",
                    person: [
                        { id: '001', name: '马冬梅', age: 25, gender: '女' },
                        { id: '002', name: '周冬雨', age: 20, gender: '女' },
                        { id: '003', name: '周杰伦', age: 21, gender: '男' },
                        { id: '004', name: '帅邓伦', age: 22, gender: '男' },
                    ],
                    type: 0,
                    person2: []
                }
            },
            watch:{
                //监听str
                str:{
                    //开启立即监听
                    immediate: true,
                    handler(newStr){
                        //过滤
                        const filterArr = this.person.filter((item)=>{
                            return item.name.indexOf(this.str) !== -1
                        })

                        //默认排序
                        if(this.type === 0){
                            return this.person2 = filterArr
                        }

                        const sortArr = filterArr.sort((a , b)=>{
                            return this.type === 1? a.age-b.age : b.age-a.age
                        })

                        this.person2 = sortArr
                    }
                }
            },
            methods:{
                sort(num){
                    this.type = num
                }
            }
        })
    </script>
</body>

</html>